Question about MD/CRNA and my son's surgery

Hey all,

So my son had surgery last month and before the procedure, the CRNA comes out and explains how they are going to use the gas, gets consent, etc. She was great- we really liked her. Then the MDA comes out and corrects the CRNA saying they'll use gas AND a nerve block (I still question the necessity of that). She was kind of rude and abrupt- didn't make me feel all that comfortable.

My son went back to surgery comes out- he did great but didn't really handle the nerve block well (crying about his legs and how they hurt). The MDA had to come back to give him something. I ask and she says "Oh, I'm giving him morphine" and then walks off and tells the PACU nurse "I just gave him Toradol". Huh?

Anyway, LONG STORY SHORT- we probably would have been much happier with just the CRNA on our son's case (not trying to start a "who's better" debate). We just felt like we trusted the CRNA more. So here's the question- when doing surgery in a big teaching hospital where there are CRNAs AND MDs, how exactly does the relationship work? What is the role of the CRNA and do they act independently from the MDs.

Thanks for reading and your insight is greatly appreciated